Need suggestions about replacement on platz engine

AOA PAKWHEELERS,
I am owner of 2002 toyot platz .The engine of the car needs replacement it [1000cc 1sz-fe] and injectors+ignition coils of cars also need to be replaced .should i buy a 1000cc engine or go for a 1300cc 2nz-fe .i want to know will it effect my cars value and what will be its cost for both engines and from where to get it cheap in rawalpindi and islamabad